Try a battery tester
CR2032
A person can tell the proper size by knowing the size of the notches on the battery before heading to the store to purchase. Then based on the size that will determine the battery terminal size required for the battery.
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Drive to anyplace that sells batteries and the will load test if for free.
Anyplace that sells batteries can tell you the correct size to purchase. Walmart sells and excellent battery at a good price.
Remove the battery and take it to an auto parts store for testing. They can tell you if it is bad. If it is good, then remove the starter and do the same thing.
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Over and over as long as the donor car is running. How many times is hard to tell.
A good lead/acid battery will measure about 13.2 vdc. If that is happening it seems to be good. A load test at your local battery sales point would tell you if it is bad. There are amp probes that clamp on the battery lead and will show the current flowing. If the car is starting and you are seeing a higher than 13.2 vdc at the battery (switching to 13.2 when the battery is charged) then the alternator is working and the battery is good. Clean terminals are needed.
You check the voltage under load. Even a bad battery may have good voltage if no current is flowing, so you need an appropriate "test" load.
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Most laptops have a battery indicator which is found on the bottom right hand of the screen.This will let you know how much battery life is left and will give you an idea of when you will need to charge it.